Hamworthy Purewell Variheat mk2 70c, Инструкция по установке, наладке и обслуживанию

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HAMWORTHY HEATING LTD
7
PUREWELL Variheat mk2 218612 A03
4.3 Flues
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Flue termination, routing and construction must comply with the requirements of the Clean Air Act 1993—Chimney
Memorandum, BS 6644 BS 5440 and IGE/UP/10.
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Any flue must be self supporting and separable from the boiler for servicing requirements.
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The maximum number of modules firing into a common chimney is 9. For larger installations refer to HHL Technical.
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Due to the low flue gas temperature, 50°C (condensing) - 75°C (non-condensing), condensation will occur in the flue,
flue materials must be non-corrosive and utilise fully sealing joints.
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Flue construction is recommended of a twin wall, insulated type to maintain buoyancy within the flue.
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Adequate facilities must be provided for draining the flue condensation.
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Horizontal flue runs must be kept as short as possible and be inclined at minimum 2° towards the termination.
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The flue system must be designed acknowledging that there may be a positive pressure generated by the boiler
combustion fan. Refer to Appendix C.
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The flue system must be designed to limit the max. suction (cold) to 30Pa negative, measured at the connection to
the boiler. If the suction is greater than 30Pa, refer to HHL Technical.
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This condition must then be checked hot and with all boilers firing, the max. pressure at the connection to
the boiler should be 100Pa positive.
In the event that the flue system when hot does generate a suction, the max. suction is 100Pa.
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Any stabiliser fitted must be in or close to the vertical chimney.
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Fan dilution - the design must provide for the use of balancing and trim dampers, and their location and
operation must be such that the constraints detailed above can be met. Care must be taken to ensure that
the fan performance is matched to deliver the appropriate dilution, whilst ensuring that the excessive suction
is not applied to the boilers. If in doubt, refer to HHL Technical.
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Fan assist - the use of fan assist must only be a last resort, as the boilers have sufficient fan performance to
drive the system. If in doubt, refer to HHL Technical.
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Connecting flue systems may be smaller in internal diameter than the boiler connection and must be
designed to deliver the necessary condition at the connection to the boiler. Refer to Hamworthy Heating
Technical dept. for assistance.